How to manage purple sweet potato seedlings? Latest technical method tutorial
Purple sweet potato and sweet potato are actually quite similar plants, and both are very popular food crops. They have a very wide planting area in our country. When planting purple sweet potatoes, we need to adjust the management methods according to the growth stage of the purple sweet potato. Among these, management during the seedling stage is very important, so how should purple sweet potatoes be managed during the seedling stage? Today, the editor brings you the management techniques for the purple sweet potato seedling stage. Let's take a look together!
1. Temperature control
During the purple sweet potato seedling stage, temperature control is very important. The temperature inside the film should be maintained at around 28 degrees. However, at noon on sunny days, because the temperature will be relatively high, you must pay close attention to temperature changes inside the film. If the temperature is too high at this time, it may cause seedling scorching. We should reasonably adjust the temperature according to weather changes and take timely measures such as cooling and warming. During the seedling raising period, the early stage should focus mainly on sprouting with high temperature, the middle stage should maintain a stable temperature to promote seedling growth, and the later stage should use appropriately low temperatures for hardening the seedlings.
The main point is that before the potato buds emerge from the soil, this is the early stage of seedling raising, and at this time we should focus mainly on sprouting. The temperature inside the film can be appropriately increased, but it must not be higher than 35 degrees. Under normal conditions, ventilation is not necessary. Then, from full emergence to 10 days before seedling harvesting is the middle stage of seedling raising. At this time, the temperature should be appropriately lowered and maintained at around 25-30 degrees, and temperature regulation should be done well. Then, one week before transplanting to the field, the temperature should be lowered to atmospheric temperature, without heating, and the film should be appropriately opened for low-temperature seedling hardening. This enhances the adaptability of sweet potato seedlings to the environment and improves the growth ability of the seedlings.
2. Reasonable watering
Before the sweet potato seedlings emerge from the soil, watering should not be excessive and may even be skipped. This avoids affecting seed germination. However, after the seedlings fully emerge, pay attention to watering thoroughly once, and also water promptly once after seedling harvesting. Then, during the seedling hardening period and before seedling harvesting, do not water. During high-temperature periods, keep the plants from lacking water. During low-temperature seedling hardening, keep the soil in a state of alternating dry and wet, with the surface dry and the lower layer wet. If the soil is too dry and needs watering, under low-temperature conditions it should be done in the morning, while under high temperature it should be done in the morning and evening.
3. Timely topdressing
When watering sweet potato seedlings, it can be combined with topdressing work. The fertilizer for topdressing should be mainly nitrogen fertilizer, such as urea. When fertilizing, be sure to control the amount and concentration of fertilizer well, and the concentration must never be too high. Follow the principle of applying more frequently but in small amounts, and do not directly broadcast or pour too wet, so as to avoid seedling scorching caused by excessive fertilizer heat. Finally, when purple sweet potato seedlings grow to about 25 cm high, harvest the seedlings and transplant them into the field. If seedling harvesting is too late, the growth space for purple sweet potato seedlings will be too crowded. This will affect the growth of the lower small seedlings and reduce yield.
The above is a brief introduction to the management techniques for the purple sweet potato seedling stage. That is all for today's introduction. This article is for reference only, and we hope it can help everyone!